Lighting unit



Oct. 14, 1941. c. F. HERBOLD LIGHTING UNIT Filed Jan.

Q l I RN Y Patented Oct. 14, 1941 LIGHTING UNIT Carl F. Herbold,Lakewood, Ohio, assignor to Westinghouse Electric & ManufacturingCompany, East Pittsburgh, Pa., a corporation of.

Pennsylvania Application January 12, 1939, Serial No.250,5 36

2 Claims.

I My invention relates in general to lighting unitsyand in particular toenclosed type street lighting units'which utilize sodium or other typesof vapor discharge lamps as a source of light.

In order to effect a proper lighting of a street or highway, it is oftendesirable to use auxiliary reflectors, which extend downwardly withinthe globe of the lighting unit. Such reflectors are so placed as todirect most of the rays emitted from the light source into a relativelynarrow beam vwhich is substantially parallel with the street 'orhighway, and permit only a relatively ininor portion of the emittedlight to be directed toward the house side, or at right angles to thestreet or highway.

It has been common practice to support such reflectors from the upper orhood portion of the unit, the reflecting surfaces extending into theenclosed globe and being placed adjacent to the light source.

The vapor type lamp being in most instances of substantially tubularshape and relatively long as compared to the length of Mazda lamps,requires a reflector which extends downwardly for substantially theentire length of the lamp or below the lower tip of the lamp in order toproduce a proper distribution of all the emitted light. 1

Lighting units of the so-called open type, utilizing vapor lamps, suchas the sodium lamp, have been used for some time for street or highwaylighting. When it became desirable to adapt such sodium lamps to pendanttyp units provided with enclosing globes, it was found that therelatively long reflectors which were necessary to use with the vaporlamps could no longer be supported from the upper hood in fixed relationto the lamp for the reason that these reflectors when made in suchlengths as are required for proper light distribution would interferewith the opening and closing movements of the globe, and also interferewith the ready replacements of lamps or repairs to the internal portionof the unit.

The object of my invention, generally stated, is to provide a practicaland novel arrangement for supporting such a reflector system whereby theenclosing globe may be easily opened and which will readily permitreplacement of lamps.

A more specific object of my invention is to provide for supoprting suchreflectors from the globe holder which supports the enclosing globe andwhich is pivotally supported from th hood to effect pivotal movement ofthe globe reflectors,

facilitating replacement of lamps and permitting easy access to theinterior of the hood portion of the lighting unit when repairs arenecessary.

These and other objects of my invention will become more apparent in thedescription to follow taken in conjunction with the accompanying drawingin which:

Figure 1 is a front view of a preferred embodiment of my invention,partly in elevation and partly in section; V

Fig. 2 is a view taken along the lin 11-11 of Fig. 1 being partly insection and partly in elevation; I

Fig; 3 is a View similar to Fig. 1 showing the globe moved toja partlyopened position;

Fig. 4 is a plan view of the globe holder and reflectors taken along theline IV-IV of Fig. 1;

Fig. 5 is an enlarged sectional view taken along the lineV-QV of Fig. 4,and

Fig. 6 is a fragmentary view, in elevation, showing the manner in whichthe enclosing glob is supported on theglobe holder.

Referring to Fi re 1, which is a preferred form of a lighting unitembodying the principal features of my invention, a hood 8 is providedwith an upper portion 9 including means for attaching the lighting unitto a bracket or any other suitable support, not shown, and a bowllikelower portion I0 which houses the fixture and socket assembly-forreceiving the lamp.

To provide for pivotally supporting a globe holder l l, the lowerportion l0 may be provided with a depending flange portion [2 on itslower edge which carries on its inner face a pivot support I3 and alatching member I4 which cooperate with complementary pivot and latchmembers I5 and I6, respectively, on the globe holder.

The light source comprises a vapor lamp I! which is of elongated tubularshape and may be provided with an outer enclosing flask l8 which isutilized to keep the lamp ll at a proper elevated temperature which isnecessary for its operation. The lamp l1 and its associated fixture forconnecting the lamp to the lighting circuit may be housed within thelower portion ID of the hood 8 in any well known manner, not shown.

The globe holder II, which is shown more in detail in Figs. 4, 5, and 6,is circular in shape and may be provided with a depending annularchannel portion 2| on its bottom face for receiving the opening edge ofany suitable enclosing globe 22. The globe 22 may be secured to theglobe holder H by a split band member and globe ho to an p t o thereby23 provided with a plurality of outwardly extending lugs 24 which areengaged by the screws 25 extending through the rim of the globe holderII as shown in Figure 5. A gasket 26 may be inserted in the dependingchannel 2| of the globe holder ll. Likewise a gasket 21 may be fastenedin any suitable manner to the bottom face of lower portion ll] of hood8'. These two gaskets are effective in making the lighting unitrain-proof.

The reflector system which I prefer to use comprises a pair ofreflectors 28 and 29, each of which is provided with a pair ofreflecting surfaces which terminate in substantially a line which isvertical and closely adjacent'to the flask [8, as shown in Figs. 2 and4. As'hereinbefore explained, the reflectors 28 and 29 are made toextend below the lower tip of the light source I! to effect a properlight distribution and are provided with curved outer edges which followgenerally the curvature of the enclosing globe 22'.

Referring now to Fig. 4, the reflectors 28- and 29 may be fastened tothe inner periphery of globe holder II by means of a plurality of lugs3i which may be riveted or otherwise secured to reflectors 28 and 29 andattached to the upper face of globe holder H by means ofa plurality ofscrews 33" which thread into suitable openings in the upper face of theglobe holder. Y

Since the lamp l1 and its outer flask l8. pro-' ject well within theglobe 22, it will be, evident that reflectors 28 and '29 must be sosupported on the globe holder ll that they will not strike the flask I8when the globe and reflectorsare moved to their open position I haveattained such a result by mounting the reflectors on the globe holder atsubstantially right angles to the hinge member I and latching-member I6of the globe holder. Referring-now toFig. 3, it will be apparent thatwhen'the globe andglobe holder are pivotally moved to their openposition, the reflectors-will move therewith in aplanewhich issubstantially coincident with the plane of such pivotalmovement; It willbe evident that with such-anarrangement the reflectors may be of anyvdesired length as determined by the depth of the globe and willnot'interfere in any way with the opening and closing of the globe.

supported from the globe holder may be utilized without departing fromthe spirit and scope of my invention.

In conclusion, it will be evident that I have provided a practical andnovel type of support for reflectors which are utilized with lightingunits of the enclosed type having an elongated light source.

I claim as my invention:

1. In an enclosed pendant type lighting unit,

. the combination of a hood, a globe ring, means for pivotallysupporting said globe ring on said hood, a globe supported by said globering, an

a means, whereby said reflectors clear said lamp It will be understoodthat the form of reflecwhen said globe ring is pivotally moved to itsopen position.

2. In-an enclosed pendant type lighting unit; the combination of ahood,a globe ring, means for .pivotallyisupporting Psaid globe ring on saidhood so that it may be swung to an open posi-' tion, a globe supportedby said globe ring, an elongated tubular'qlamp extending within saidglobe, said globe ring being of such inside diameter as to clear thelower end of the lamp when the globe ring-' is swung to its openposition, a pair of reflectors disposed in juxtaposition within saidglobe, each of said-reflectors being generally equal in length to thelength of said tubular lamp, and comprising a pair of reflectingsurfaces merging in substantially a line closely adjacent to and-onopposite sides of said lamp, and means for supporting said reflectors onsaid globe ring in such position that the plane defined by the verticalcenter lines of said reflectors is displaced at substantially rightangles to the vertical plane defined by the pivotal supporting means forsaid globe ring, whereby the globe ring and globe may be swung to theopen position without interference between the lamp andreflectors.

' 1 CARL F. HERBOLD.

